TITLE

Gyrokinetic particle simulations of toroidal momentum transport

AUTHOR(S)
Holod, I.; Lin, Z.
PUB. DATE
September 2008
SOURCE
Physics of Plasmas;Sep2008, Vol. 15 Issue 9, p092302
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Simulations of toroidal angular momentum transport have been carried out using global toroidal gyrokinetic particle-in-cell code. The significant redistribution of toroidal momentum is observed, driven by the ion temperature gradient turbulence with adiabatic electrons, resulting in a peaked momentum profile in the central region of the radial domain. Cases with rigid and sheared plasma rotation are considered. Diffusive and off-diagonal (pinchlike) fluxes are identified. Toroidal momentum diffusivity is calculated by subtracting pinch contribution from the total momentum flux, and compared to quasilinear estimates. It is found that the ratio of momentum to heat conductivity is smaller than unity even after subtracting pinch contribution when wave-particle resonance energy is larger than thermal energy.
ACCESSION #
34621650

 

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